Vise and the like



Jan. 24, 1933. T. D; CURRIE VISE AND THE LIKE Filed Jap. 21, 1931 INVENTOR. 77202 205 2 fizzrm'e,

ATTORNEY.

Patented Jan. 24, 1933 N D STATES- THOMAS J). CURB-IE, or nmnoir mronieiini v ,vIsn AND minimize 1 n Application filed January 21,v 1931. Serial 1%; 510,264. a

The invention relates to vises clam s and the like, suitable for holding round work, and

particularly adapted to use upon threaded tubes which have to be gripped on the threaded portion. I

It is an important aim-of the invention to produce a device adapted. for. engagement withwork in such a manner that liability of damage to the work by permanent strain is avoided; It is an object especially to present means whereby the ordinaryworkman may secure safely in a vise a piece of round work having a low elastic index, and which can be readily distorted soas to impair its utility. The ordinary workmanwi'th appliances heretofore available secures round work. in a vise very often by securing it between fiat jaws, but in some instances may use a special form of jaw to receive and grip the work. In such cases the workman must tighten the vise until, the a work is gripped with suflicient security, and he gauges the critical stress of the work before failure and permanent distortion by hisexperience in observing the qualities and characteristics of such materials. a He will often And at other times he err in this estimate. will err in the utilization of the vise applying more force than he realizes, or applying it in such a way in relation to the contours and proportions of the work that damage is done before he appreciatesthe peculiarsus' ceptibility of the work. It is therefore an aim of this invention to provide a devlce in which such workmay be gripped safely with out exceeding the criticalstrain thereof beyond which it-will become permanently deformed so as to render it'unserviceable.

It is an aim to present the invention in forms adapted to use in bench or other Vises,

or in hand tools for gripping such work, to the end that the workman may operate the tools in accordance with familiar practice and manipulation, but will not be able to apply force to the work beyond that predetermined as safe for its effective clamping.

A further purposeof the invention is to offer a novel'specific construction in the apliance for attaining the ends in view. These and other objects, advantages and features of.

invention are comprised, some ofwhich will be understoodrfromthe following description and. accompanying drawing, while othersareparticularly set forth@ i Figurelof the drawing is an isometric perspective viewf of my invention in one form, with a valveshank engaged therein. F gure 2 is a cross section on the symmetr-icalaxis of Figure 1. a 1

Figure 3 is a plan of as modified clamp block. v I

Figure 4 is an edge View of the device of FigureB, a a I Figure 5 is atop viewof a vise having one form of theiinvention engaged therein and the work held thereby before tighteningof the vise.

, There isillustrated in Figuresd and? a f 1' valve disc 10, which'includesthe ez teriorly threaded tubular shank 11 and an integral a disc portion proper 12 in a plane at. right angles to the axis of the shank. The disc formed with a peripheral cylindrical interiorly threaded flangeor wall 13 and-is constructedto have secured therein the insert 14 held by an exteriorly threaded collar :14 screwed into the wall 13.-v The tool-may be used onyarious other work; :Ablock 15 of resilient suitably temperedmetalis shown,

which is nearly rectangular. This *valve body and collar are .ordinarily fo1-med of brass, and the insert of rubber It has a central threaded opening 16 of a sizeto permit the shank-'11 to be screwed snugly thereinto, a I

the block being of'a thicknessto engage over a suitable longitudinalextent of the shank.

i This block is formed with a slit 1-7 extend-v a ing' -syinmetrically across the block parallel to one side from near one edge to the opening I6 and being continued at the far sid'e of the' opening through the opposite edge of the block. I This slit is in avplane at right angles close;the;slit at the open end, distortion. of

to the major plane of theblocl; and diametrii cal with respect to the opening 16. Further- I thermore, thesu it isof a width in 'thefclear I 1 corresponding to the critic'allextent of strain ice the work Will be short of the critical stress I and strain thereof.

In addition, the block is varied from par-' allelism in its two sides 18 and 19, which are laterally of the slit, the block being narrower toward the closed end of the slit, so that when I the sides 18 and 1,9 are compressed between the jaws of a vise until the open'e'nd of the slit is closed, the sides 18 and 19 will be substantially parallel, and further closing movement of the vise prevented. 'The clear-- ance in the slit 17 for a A inch brass pipe elecompressibility to this range, said block having opposite outer wallsto engage the aws of a vise, press or the like, of such contour.

THOMAS D. CUBRI'E.

ment, threaded, is approximately five-onethousandths (.005) of an inch, and that is the degree of variance of'the sides 18 and '19 of the block from parallelism, as indicated.

In"Figures 3 and ttheinvention is emi bodied in a block 20 of similar material for a similar use, but in this instance the slit f21 stops short of the outer edges of the block on both sides of the opening 16, and .the block is formed with one side 22 parallel tothe'slit throughout, whi1e the opposite sideis formed with a central portion'23 parallel tothe side r 22 and beveled or inclined portions 24 adja-Q cent the corners of the block and overlying the slit ends; I v

a In the use of the last describedform of the device, the "block 20 has its sides 22 and-23 '1 gripped initially; betweeuthejaws of a vise while the vwork'is'engaged in the opening 16, I

and thenfupon tightening of the vise, the.

V block-v is deformed so as to permit the central portionadj'acent the edge '23 to bev pressed' Y inward toward the workuntil the outer in- I clined faces 24 are encountered by-the vise jaws, when further compression of the block 1 i is checked while the work is safely gripped by the sides'of the opening16.

' It is of course not essentla structionwithin thes cope' of the appended t claims maybe made as discretiondictatesto adapt the invention to any use involved.- f

' "In Figureifi one of the blocks previously described is shown engaged between the jaws v V 2510f a vise, the clearance indicated between r the-sides of one jaw and the inclined faces H of the block being exaggerated for the pure' of "theblockf'15 andthe block 20 which. are

not slitted may be termed non-compressible portions, in view of the fact that-theyare relatively so resistant to compression asto T pose of illustration.

V 1 that the open- Q ingr16' be threaded if smooth round work is to be held, and many variations of the con V It shouldbeappreclated that the po'rtions ordinarilyprevent compression ofthe other 1 side of the blockrloeyond the predetermined limits.

I I claim:-

A clamping but "compression limiting de- T vice comp'risinga block havlng'a WOIk-I'BCBlV- Ling aperture and slits; radiating from'said Y M aperture to allow: compressibility to the ex I tent ofthe width ofsaid-slits but limiting the i 

